Apparatus for washing pulp for paper-making purposes and the like



S. MlLNE.

APPARATUS FOR WASHING PULP FOR PAPER MAKING PURPOSES AND THE LIKE- APPHCATION FILED JULY 24. I917.

Patented Feb. 8,1921

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APPARATUS FOR WASHING PULP FOR PAPER MAKING PURPOSES AND THE LIKE. APPLICATION FILED JULY 24. I912.

1, 3,67,7()7, Patented Feb. 8,1921.

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VIII! III I II I III I I I {III/III III/A UNITED STATES PATENT OFFICE.

SAMUEL MILNE, OF EDINBURGH, SCOTLAND.

Specification of Letters Patent.

Patented Feb. 8, 1921.

Application filed July 24, 1917. Serial No. 182,444.

To all whom it may concern:

Be it known that I, SAMUEL MILNE, a subject of the King of Great Britain and Ireland, and resident of Edinburgh, Facotland, have invented certain new and useful Tmprovements in Apparatus for Washing Pulp for Paper-Making Purposes and the like, of which the following is a specification.

This invention relates to the treatment of pulp and consists in passing thepulp across a perforated drum in which is arranged a series of sprinklers adapted to project a spray on to the portion of the drum surrounded by the pulp, provision belng made to drain the contaminated fluid from the drum. The invention is primarily intended for use in combination with a Hollander engine, or a washing or beating engine.

The invention will be more particularly described by the aid of the accompanying drawing, in which-- Figure 1 is a cross-sectional view of a washing and beating engine showing the invention applied, and

Fig. 2 is a transverse section through the perforated drum.

Referring to the drawings, the trough or casing a is the usual endless trough of a Hollander washing or beating engine, the pulp passing along the two channels I) and b. The trough is of any usual construction and may be fitted with a roll and bedplate of any ordinary construction, the roll being used to circulate the material and disintegrate it while at the same time any chemical can be used for treating the pulp. The

trough is fitted with a washing drum 0,

constructed with a perforated surface over which is placed wire cloth of a suitable fine mesh. The drum is provided at one end with a hollow trunnion (Z ournaled in a bearing on the bracket 6 carried from the main casing. Rig-idly secured to the opposite end of the drum 0 is a shaft f journaled on the bracket g and arranged to be driven by means of a suitable gearing (such as the spur wheel 71, and pinion h) from the belt pulley i.

Passing through the hollow trunnion (Z is a pipe j which is rigidly secured to the bracket 6. The pipe j is connected to a suitable source of supply and extends the full length of the drum 0, the inner end belng closed by a cap. Radiating from the pipe j are a number of pipes y" leading to sprinkler pipes 7' lying near to the inner periphery of the drum and parallel to the axis of same. The inner end 0 of the drum is closed while the outer end 0 is open and abuts against a suitable flange 0 of corresponding radius fixed to the casing or trough. To prevent escape of fluid between the drum and flange a felt or leather band at is provided to cover the joint, said band being connected to the brackets n, a, see Fig. 2, provision being made to adjust the length of the band to insure against leakage.

An outlet is provided in the side of the trough Z) located to discharge the water from the interior of the drum through the cook or valve into the waste pipe Z.

In practice the pulp circulates in the trough b, b in the usual manner, the circulation being produced by the-roll (not shown) and assisted by the lower part of the drum 0. The circulation may be continued for any desired length of time as required for the mechanical and chemical treatment, without any washing being done, and during this time the waste water valve or cock 7c is closed. lVhen the pulp is sufficiently treated mechanically and chemically, cook 70 is opened and the water supply for pipe j being turned on jets of water are sprayed on the inner surface of the drum at that portion of the same in contact with the pulp, thereby exercising a cleaning effect both upon the drum and the pulp, the contaminated fluid flowing via the outlet l: to the waste pipe Z.

What "I claim is Apparatus for treating pulp comprising in combination a trough through which the pulp is traversed, a perforated drum rotatably mounted in said trough above and in contact with the pulp, a series of sprinklers within the drum so disposed as to constantly project streams of fluid upon that are of the drum immediately in contact with the pulp, together with a drain outlet from the drum arranged so that the deleterious matter is discharged from said drum, substantially as described.

In witness whereof I have hereunto set my hand'in the presence of two witnesses.

SAMUEL MILNE.

Witnesses FREDERICK PIATT, Grooms WHITELAW. 

